The p-V-T equation of state of magnesium metal has been measured up to 20 GPa and 1500 K using both multianvil and opposite anvil techniques combined with synchrotron x-ray diffraction. To fit the experimental data, the model of Anderson–Grüneisen has been used with fixed parameter δT. The 300-K bulk modulus of B0 = 32.5(1) GPa and its first pressure derivative, B0′ = 3.73(2), have been obtained by fitting available data up to 20 GPa to the Murnaghan equation of state. Thermal expansion at ambient pressure has been described using second order polynomial with coefficients a = 25(2) × 10−6 K−1 and b = 9.4(4) × 10−9 K−2. The parameter describing simultaneous pressure and temperature impact on the thermal expansion coefficient (and, therefore, volume) is δT = 1.5(5). The good agreement between fitted and experimental isobars has been achieved to relative volumes of 0.75. The Mg melting observed by x-ray diffraction and in situ electrical resistivity measurements confirms previous results and additionally confirms the p-T estimations in the vicinity of melting.
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7 February 2020
Research Article|
February 05 2020
Thermoelastic equation of state and melting of Mg metal at high pressure and high temperature
Alexandre Courac
;
Alexandre Courac
a)
1
Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Université
, UMR CNRS 7590, Muséum National d’Histoire Naturelle, IRD UMR 206, 75005 Paris, France
2
Institut Universitaire de France (IUF)
, 75005 Paris, France
a)Author to whom correspondence should be addressed: [email protected]
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Yann Le Godec;
Yann Le Godec
1
Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Université
, UMR CNRS 7590, Muséum National d’Histoire Naturelle, IRD UMR 206, 75005 Paris, France
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Vladimir L. Solozhenko
;
Vladimir L. Solozhenko
3
LSPM-CNRS, Université Paris Nord
, 93430 Villetaneuse, France
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Nicolas Guignot;
Nicolas Guignot
4
Synchrotron SOLEIL
, 91192 Gif-sur-Yvette, France
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Wilson A. Crichton
Wilson A. Crichton
5
ESRF—The European Synchrotron Facility
, 71, avenue des Martyrs, 38000 Grenoble, France
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Alexandre Courac
1,2,a)
Yann Le Godec
1
Vladimir L. Solozhenko
3
Nicolas Guignot
4
Wilson A. Crichton
5
1
Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie (IMPMC), Sorbonne Université
, UMR CNRS 7590, Muséum National d’Histoire Naturelle, IRD UMR 206, 75005 Paris, France
2
Institut Universitaire de France (IUF)
, 75005 Paris, France
3
LSPM-CNRS, Université Paris Nord
, 93430 Villetaneuse, France
4
Synchrotron SOLEIL
, 91192 Gif-sur-Yvette, France
5
ESRF—The European Synchrotron Facility
, 71, avenue des Martyrs, 38000 Grenoble, France
a)Author to whom correspondence should be addressed: [email protected]
J. Appl. Phys. 127, 055903 (2020)
Article history
Received:
November 12 2019
Accepted:
January 19 2020
Citation
Alexandre Courac, Yann Le Godec, Vladimir L. Solozhenko, Nicolas Guignot, Wilson A. Crichton; Thermoelastic equation of state and melting of Mg metal at high pressure and high temperature. J. Appl. Phys. 7 February 2020; 127 (5): 055903. https://doi.org/10.1063/1.5135649
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